Pipe expander and pipe structure

Abstract

The utility model relates to a pipeline telescopic device and pipeline structure, wherein, a pipeline telescopic device, including bellows, two respectively fixed connection in the bellows both ends flange disc and at least three roots periphery distribution in the bellows outside pull rod, two the flange disc's edge outer end all fixedly connected with at least three connection plates, and each the connection plate all rotatoryly connected with rotating ball, two the flange disc on the connection plate with the pull rod equal and one -to -one correspondence, the pull rod is telescopic rod structure, and both ends are fixedly connected in two the flange disc corresponding the connection plate on rotating ball. The utility model can improve the existing bellows telescopic device's pull rod when being used in two pipelines to be communicated in different straight line direction, and the pull rod cannot adaptively adjust the technical problem of position.

Description

TECHNICAL FIELD

[0001] The utility model relates to material conveying pipe network equipment technical field, especially a kind of pipe expansion joint and pipe structure. BACKGROUND

[0002] Pipe expansion joint (also known as expansion joint, compensator, expansion joint) can prevent pipe leakage and damage due to excessive displacement of compensation joint, mainly used for absorbing axial displacement and bearing axial pressure thrust pipe sleeve connection within the allowable displacement range, large expansion amount, easy and fast installation.

[0003] Common expansion joint is divided into several types such as corrugated expansion joint, sleeve expansion joint and square natural compensation expansion joint, among which corrugated expansion joint is more commonly used. Corrugated compensator mainly includes corrugated pipe, two flanges fixedly connected to both ends of corrugated pipe and multiple pull rods; wherein, corrugated pipe compensates the displacement generated when pipe deforms in radial and / or axial direction through its elastic deformation; both flanges are used to connect pipes; multiple pull rods are distributed circumferentially on the outside of corrugated pipe through not less than three, and both ends of pull rod are respectively threaded into two flanges and fixed through nut, so that after flange is installed in place, pull rod limits excessive deformation of corrugated pipe and enhances overall stability of compensator.

[0004] Usually, two pipes to be connected are in the same straight line, and corrugated expansion joint can be normally installed. When two pipes are in different axial directions, although the deformation of corrugated pipe can normally connect two pipes, pull rod cannot be adaptively inclined and complete installation action. INVENTION CONTENTS

[0005] The utility model provides a kind of pipe expansion joint and pipe structure to the technical problem that the pull rod of existing corrugated expansion joint cannot adaptively adjust position when being used in two pipes to be connected in different straight line directions.

[0006] The technical solution of the utility model to solve the above technical problem is as follows:

[0007] On the one hand, the utility model provides a kind of pipe expansion joint, including corrugated pipe, two flanges fixedly connected to both ends of corrugated pipe and at least three pull rods distributed circumferentially on the outside of corrugated pipe, at least three connection plates are fixedly connected to the edge outer end of two flanges, and each connection plate is rotatably connected with rotating ball, the number of connection plate and pull rod on two flanges is equal and one-to-one correspondence, pull rod is telescopic rod structure, and both ends are respectively fixedly connected to rotating ball on corresponding connection plate of two flanges.

[0008] The utility model discloses beneficial effect is: when installing, when the position of two flange plates is offset, under the rotary connection of rotary ball, each pull rod is relative to two flange plates and rotates, realizes the position self -adaptation adjustment of pull rod, and the length of pull rod is adaptively contracted in the adjustment process, to improve the technical problem that the pull rod of the existing bellows expander cannot adaptively adjust the position when being used in the two pipelines to be communicated in different straight line directions.

[0009] On the basis of the above technical scheme, the utility model still can make following improvement.

[0010] Further, each of the connecting plates is provided with an installation hole, and each of the rotary balls is rotatably connected to the installation hole of the corresponding connecting plate.

[0011] The beneficial effect of the above further scheme is to install the rotary ball through the installation hole.

[0012] Further, the center of each of the rotary balls is located in the plane of the corresponding connecting plate.

[0013] The beneficial effect of the above further scheme is to ensure that the rotary ball does not come off the connecting plate.

[0014] Further, the hole wall of each of the installation holes is an arc structure matched with the spherical surface of the corresponding rotary ball, and the radius of each of the rotary balls is greater than the thickness of the corresponding connecting plate.

[0015] The beneficial effect of the above further scheme is to stably install the rotary ball through the installation hole with the arc inner wall, and at the same time, the radius of the rotary ball is greater than the thickness of the corresponding connecting plate, so that the spherical surface of the rotary ball protrudes from the plate surface of the connecting plate, ensuring that the rotary ball can be fixedly connected with the pull rod, and the connecting plate does not hinder the adjustment of the angle of the pull rod.

[0016] Further, each of the pull rods comprises a sleeve rod, a sliding rod and a limiting piece, one end of the sleeve rod is fixedly connected to the corresponding rotary ball of one of the flange plates, the other end is provided with a sliding hole, one end of the sliding rod is matched with and slidably connected to the corresponding sliding hole, the other end is fixedly connected to the corresponding rotary ball of the other flange plate, and the limiting piece is used to control the relative sliding between the sleeve rod and the sliding rod.

[0017] The beneficial effect of the above further scheme is that during installation, the limit of each limiting piece is removed first, so that the two flange plates are installed in place, and during the installation process, each pair of sleeve rods and sliding rods are always located on the same straight line and slide relative to each other, so that the length of the pull rod is adaptively contracted, and after the two flange plates are installed in place, the limiting piece is installed to limit the length of the pull rod, thereby limiting the excessive deformation of the bellows and enhancing the overall stability of the compensator.

[0018] Further, the outer wall of the other end of each sleeve rod is provided with at least one insertion hole, each of the insertion holes is through the other end of the corresponding sleeve rod, one end of each sliding rod is fixedly connected with at least one insertion plate, and each insertion plate penetrates through the corresponding insertion hole; each limiting piece comprises a first nut and a second nut, the first nut and the second nut are threadedly connected to the sleeve rod and respectively abut the two sides of the corresponding insertion plate.

[0019] The beneficial effect of the above further scheme is that when installing the two flanges, the first nut and the second nut are first screwed away from the insertion plate, during the installation process, the insertion plate slides in the corresponding insertion hole, after the two flanges are installed in place, the insertion plate is slid into place, and then the first nut and the second nut are screwed to abut against the insertion plate, so that the pull rod always maintains its length and limits the excessive deformation of the corrugated pipe.

[0020] Further, the outer wall of the other end of each sleeve rod is provided with at least one insertion hole, each of the insertion holes is through the other end of the corresponding sleeve rod, one end of each sliding rod is fixedly connected with at least one insertion plate, and each insertion plate penetrates through the corresponding insertion hole; each limiting piece comprises a first nut and a second nut, the first nut is threadedly connected to the sleeve rod and abuts against the side of the corresponding insertion plate close to the other end of the sliding rod, and the second nut is threadedly connected to the sliding rod and abuts against the other end of the corresponding sleeve rod.

[0021] The beneficial effect of the above further scheme is that when installing the two flanges, the first nut is first screwed away from the insertion plate, and the second nut is screwed away from the other end of the sleeve rod at the same time, during the installation process, the insertion plate slides in the corresponding insertion hole, after the two flanges are installed in place, the insertion plate is slid into place, the first nut is first screwed to abut against the insertion plate, and then the second nut is screwed to abut against the other end of the sleeve rod, so that the pull rod always maintains its length and limits the excessive deformation of the corrugated pipe.

[0022] Further, each limiting piece further comprises two gaskets, and the two gaskets are respectively arranged on the side of the first nut and the second nut for abutment.

[0023] The beneficial effect of the above further scheme is that the damping effect is formed by the gaskets to prevent the first nut and the second nut from loosening during use, so that the limiting length function of the pull rod is invalid.

[0024] Further, the opening of each insertion hole towards the other end of the sliding rod is chamfered to form an inclined surface.

[0025] The beneficial effect of the above further scheme is that the insertion plate can be smoothly inserted into the insertion hole through the guiding effect of each inclined surface.

[0026] In another aspect, the utility model provides a pipeline structure, including pipeline telescopic ware, still include ball valve, straight pipe section, flow meter and sealing valve, ball valve, straight pipe section and flow meter are communicated in proper order, and the corrugated pipe is communicated flow meter and sealing valve through two flange plate respectively. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the structure diagram of pipeline telescopic ware of the utility model, and the first scheme structure of limit piece is shown;

[0028] Figure 2 It is the partial explosion view of Figure 1 ;

[0029] Figure 3 It is the partial enlarged view of Figure 2 ;

[0030] Figure 4 It is the structure diagram of pipeline telescopic ware of the utility model, and the second scheme structure of limit piece is shown;

[0031] Figure 5 It is the partial enlarged view of Figure 4 ;

[0032] Figure 6 It is the structure diagram of pipeline structure of the utility model.

[0033] In the drawings, the component list represented by each sign is as follows:

[0034] 1, corrugated pipe, 2, flange plate, 3, pull rod, 31, sleeve rod, 311, sliding hole, 312, insertion hole, 313, inclined surface, 32, sliding rod, 321, insertion plate, 33, limit piece, 331, first nut, 332, second nut, 333, washer, 4, connecting plate, 41, mounting hole, 5, rotating ball, 6, ball valve, 7, straight pipe section, 8, flow meter, 9, sealing valve. DETAILED DESCRIPTION

[0035] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.

[0036] In one aspect, the utility model provides a pipeline telescopic ware, and specific see the following elaboration.

[0037] Example 1

[0038] As Figures 1 to 5The utility model provides a pipeline telescopic device, including bellows 1, two flanges 2 fixedly connected on the both ends of bellows 1 respectively and at least three pull rods 3 distributed in the circumference of the outside of bellows 1, the edge outer end of two flanges 2 is fixedly connected with at least three connecting plates 4, and each connecting plate 4 is rotatably connected with rotating ball 5, the number of connecting plate 4 on two flanges 2 is equal with pull rod 3 and one-to-one correspondence, and pull rod 3 is telescopic rod structure, and both ends are fixedly connected with rotating ball 5 on the connecting plate 4 of two flanges 2 respectively.

[0039] The beneficial effects of the embodiment are that when the positions of the two flanges 2 deviate during installation, each pull rod 3 rotates relative to the two flanges 2 under the rotatable connection of the rotating ball 5, realizing adaptive adjustment of the position of the pull rod 3. During the adjustment process, the length of the pull rod 3 is adaptively contracted to improve the technical problem that the pull rod 3 of the existing bellows telescopic device cannot adaptively adjust the position when the two pipelines to be connected are in different straight line directions.

[0040] Embodiment 2

[0041] As Figures 1 to 3 On the basis of embodiment 1, each connecting plate 4 is provided with an installation hole 41, and each rotating ball 5 is rotatably connected to the installation hole 41 of the corresponding connecting plate 4.

[0042] The beneficial effects of the preferred scheme in the above embodiment are that the installation of the rotating ball 5 is realized through the installation hole 41.

[0043] Embodiment 3

[0044] As Figure 1 And Figure 2 On the basis of embodiments 1 and 2, the center of each rotating ball 5 is located in the plane of the corresponding connecting plate 4.

[0045] The beneficial effects of the preferred scheme in the above embodiment are that the rotating ball 5 is ensured not to be separated from the connecting plate 4.

[0046] Embodiment 4

[0047] As Figure 1 And Figure 2 On the basis of embodiments 1-3, the hole wall of each installation hole 41 is an arc structure matched with the spherical surface of the corresponding rotating ball 5, and the radius of each rotating ball 5 is greater than the thickness of the corresponding connecting plate 4.

[0048] The beneficial effect of the preferred solution in the above embodiment is that the rotating ball 5 is stably installed by the mounting hole 41 with the arc surface structure inner wall, and the radius of the rotating ball 5 is greater than the thickness of the corresponding connecting plate 4, so that the spherical surface of the rotating ball 5 protrudes from the plate surface of the connecting plate 4, ensuring that the rotating ball 5 can be fixedly connected with the pull rod 3, and the connecting plate 4 will not hinder the adjustment of the angle of the pull rod 3.

[0049] Embodiment 5

[0050] As Figures 1 to 3 On the basis of embodiments 1-4, each pull rod 3 comprises a sleeve rod 31, a sliding rod 32, and a limiting piece 33, one end of the sleeve rod 31 is fixedly connected to the corresponding rotating ball 5 of one of the flange plates 2, the other end is provided with a sliding hole 311, one end of the sliding rod 32 is adapted and slidably connected to the corresponding sliding hole 311, the other end is fixedly connected to the corresponding rotating ball 5 of the other flange plate 2, and the limiting piece 33 is used to control the relative sliding between the sleeve rod 31 and the sliding rod 32.

[0051] The beneficial effect of the preferred solution in the above embodiment is that when installing, the limit of each limiting piece 33 is removed first, so that the two flange plates 2 are installed in place, and during the installation process, each pair of sleeve rod 31 and sliding rod 32 are always located on the same straight line and slide relative to each other, so that the length of the pull rod 3 is adaptively contracted, and after the two flange plates 2 are installed in place, the limiting piece 33 is installed to limit the length of the pull rod 3, thereby limiting the excessive deformation of the corrugated pipe 1 and enhancing the overall stability of the compensator.

[0052] On the basis of the above embodiment, the outer diameter of one end of the sleeve rod 31 is smaller than the outer diameter of the other end, and the outer diameter of the other end of the sliding rod 32 is smaller than the outer diameter of one end, so as to ensure that the sleeve rod 31 and the sliding rod 32 will not collide with the connecting plate 4 when rotating.

[0053] The sliding hole 311 can be a circular hole or a polygonal hole.

[0054] Embodiment 6

[0055] As Figures 1 to 3 On the basis of embodiments 1-5, the outer wall of the other end of each sleeve rod 31 is provided with at least one insertion hole 312, each insertion hole 312 penetrates through the other end of the corresponding sleeve rod 31, one end of each sliding rod 32 is fixedly connected with at least one insertion plate 321, and each insertion plate 321 penetrates out of the corresponding insertion hole 312; each limiting piece 33 comprises a first nut 331 and a second nut 332, the first nut 331 and the second nut 332 are threadedly connected to the sleeve rod 31 and abut against both sides of the corresponding insertion plate 321, respectively.

[0056] The beneficial effect of the preferred solution in the above embodiment is that when installing the two flanges 2, first rotate the first nut 331 and make it away from the insert plate 321, and rotate the second nut 332 and make it away from the other end of the sleeve rod 31, during the installation process, the insert plate 321 slides in the corresponding insert hole 312, after the two flanges 2 are installed in place, the insert plate 321 is slid into place, then the first nut 331 is rotated and tightly abuts the insert plate 321, and the second nut 332 is rotated and tightly abuts the other end of the sleeve rod 31, so that the pull rod 3 always maintains its length, limiting the excessive deformation of the corrugated pipe 1.

[0057] On the basis of the above embodiment, at least two insert holes 312 are formed in the outer wall of the other end of each sleeve rod 31, and each insert hole 312 is arranged on the sleeve rod 31, so that when the first nut 331 and the second nut 332 abut the insert plate 321, the insert plate 321 is uniformly stressed.

[0058] Embodiment 7

[0059] As Figure 4 and Figure 5 On the basis of embodiments 1-5, at least one insert hole 312 is formed in the outer wall of the other end of each sleeve rod 31, each insert hole 312 penetrates the other end of the corresponding sleeve rod 31, one end of each slide rod 32 is fixedly connected with at least one insert plate 321, and each insert plate 321 penetrates the corresponding insert hole 312; each limiting piece 33 includes a first nut 331 and a second nut 332, the first nut 331 is threadedly connected to the sleeve rod 31 and abuts the corresponding insert plate 321 on the side close to the other end of the slide rod 32, and the second nut 332 is threadedly connected to the slide rod 32 and abuts the other end of the corresponding sleeve rod 31.

[0060] The beneficial effect of the preferred solution in the above embodiment is that when installing the two flanges 2, first rotate the first nut 331 and make it away from the insert plate 321, and rotate the second nut 332 and make it away from the other end of the sleeve rod 31, during the installation process, the insert plate 321 slides in the corresponding insert hole 312, after the two flanges 2 are installed in place, the insert plate 321 is slid into place, then the first nut 331 is rotated and tightly abuts the insert plate 321, and the second nut 332 is rotated and tightly abuts the other end of the sleeve rod 31, so that the pull rod 3 always maintains its length, limiting the excessive deformation of the corrugated pipe 1.

[0061] Embodiment 8

[0062] As Figures 1 to 5 On the basis of embodiments 1-6, or embodiments 1-5 and embodiment 7, each limiting piece 33 further includes two washers 333, which are arranged on the side where the first nut 331 and the second nut 332 abut.

[0063] The beneficial effect of the preferred solution in the above embodiments is that the damping effect is formed by the gasket 333 to prevent the first nut 331 and the second nut 332 from loosening during use, so that the limited length effect of the pull rod 3 is lost.

[0064] Specifically, when the first nut 331 and the second nut 332 are both threadedly connected to the sleeve rod 31, the two gaskets 333 arranged at the first nut 331 and the second nut 332 respectively abut against the two sides of the plug plate 321.

[0065] When the first nut 331 is threadedly connected to the sleeve rod 31 and the second nut 332 is threadedly connected to the slide rod 32, the gasket 333 arranged at the first nut 331 abuts against the plug plate 321, and the gasket 333 arranged at the second nut 332 abuts against the other end side surface of the sleeve rod 31.

[0066] Embodiment 9

[0067] As Figures 1 to 5 On the basis of Embodiments 1-6 and 8, or Embodiments 1-5, 7-8, the opening of each jack 312 towards the other end of the slide rod 32 is chamfered to form a bevel 313.

[0068] The beneficial effect of the preferred solution in the above embodiments is that the plug plate 321 can be smoothly inserted into the jack 312 through the guiding effect of each bevel 313.

[0069] On the other hand, the utility model provides a pipeline structure, specific see following elaboration.

[0070] Embodiment 10

[0071] As Figure 6 A pipeline structure comprises the pipeline expander as described in Embodiments 1-6 and 8-9, or Embodiments 1-5, 7-9, further comprising a ball valve 6, a straight pipe section 7, a flow meter 8 and a sealing valve 9, the ball valve 6, the straight pipe section 7 and the flow meter 8 are sequentially communicated, and the corrugated pipe 1 is communicated with the flow meter 8 and the sealing valve 9 through two flanges 2 respectively.

[0072] The pipeline expander of the utility model patent replaces the traditional fixed straight pipe section connection mode, in the metering system or the pipeline that needs to be length-adjusted, the length change caused by replacing the flow meter or the pipeline assembly in the pipeline expander compensation system or the pipeline is compensated, the normal installation and operation of the pipeline are met, the equipment vibration is absorbed, the influence of the equipment vibration on the pipeline is reduced, the deformation amount of the pipeline caused by the earthquake and the land subsidence is absorbed, and the safe operation of the pipeline is ensured.

[0073] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0074] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0075] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0076] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0077] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0078] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and modifications to the above embodiments within the scope of the present application.

Claims

1. A pipe expander comprising a bellows (1), two flanges (2) respectively fixedly connected to both ends of the bellows (1), and at least three pull rods (3) distributed circumferentially outside the bellows (1), characterized in that, The outer edges of the two flanges (2) are fixedly connected with at least three connecting plates (4), each of which is rotatably connected with a rotating ball (5), the connecting plates (4) on the two flanges (2) are equal in number to the pull rods (3) and correspond one by one, the pull rods (3) are telescopic rods, and the two ends are fixedly connected with the rotating balls (5) on the corresponding connecting plates (4) of the two flanges (2).

2. A pipe expander as claimed in claim 1, wherein Each of the connecting plates (4) is provided with a mounting hole (41), and each of the rotating balls (5) is rotatably connected with the mounting hole (41) of the corresponding connecting plate (4).

3. A pipe expander as defined in claim 2, wherein The center of each rotating ball (5) is located in the plane of the corresponding connecting plate (4).

4. A pipe expander as defined in claim 3 wherein, The hole wall of each mounting hole (41) is an arc structure matched with the spherical surface of the corresponding rotating ball (5), and the radius of each rotating ball (5) is greater than the thickness of the corresponding connecting plate (4).

5. The pipe expander of claim 1 wherein, Each of the pull rods (3) comprises a sleeve rod (31), a sliding rod (32) and a limiting piece (33), one end of the sleeve rod (31) is fixedly connected with the rotating ball (5) on one of the flanges (2), the other end is provided with a sliding hole (311), one end of the sliding rod (32) is matched and slidably connected with the sliding hole (311), the other end is fixedly connected with the rotating ball (5) on the other flange (2), and the limiting piece (33) is used for controlling the relative sliding between the sleeve rod (31) and the sliding rod (32).

6. A pipe expander as claimed in claim 5, wherein, The other end of each sleeve rod (31) is provided with at least one insertion hole (312), each insertion hole (312) penetrates the other end of the corresponding sleeve rod (31), one end of each sliding rod (32) is fixedly connected with at least one insertion plate (321), and each insertion plate (321) penetrates the corresponding insertion hole (312); each limiting piece (33) comprises a first nut (331) and a second nut (332), the first nut (331) and the second nut (332) are threadedly connected with the sleeve rod (31) and abut against the two sides of the corresponding insertion plate (321) respectively.

7. The pipe expander of claim 5 wherein, The other end of each sleeve rod (31) is provided with at least one insertion hole (312), each insertion hole (312) penetrates the other end of the corresponding sleeve rod (31), one end of each sliding rod (32) is fixedly connected with at least one insertion plate (321), and each insertion plate (321) penetrates the corresponding insertion hole (312); each limiting piece (33) comprises a first nut (331) and a second nut (332), the first nut (331) is threadedly connected with the sleeve rod (31) and abuts against the side of the corresponding insertion plate (321) close to the other end of the sliding rod (32), and the second nut (332) is threadedly connected with the sliding rod (32) and abuts against the other end of the corresponding sleeve rod (31).

8. A pipe expander according to claim 6 or 7, wherein, Each of the limiting members (33) further comprises two gaskets (333) arranged on the side of the first nut (331) and the second nut (332) for abutting.

9. A pipe expander according to claim 6 or 7, wherein, The opening of each of the insertion holes (312) towards the other end of the slide rod (32) is chamfered to form a bevel (313).

10. A pipe structure, characterized by, The pipeline expansion joint comprises a ball valve (6), a straight pipe section (7), a flow meter (8), and a sealing valve (9), the ball valve (6), the straight pipe section (7), and the flow meter (8) are sequentially communicated, and the corrugated pipe (1) is communicated with the flow meter (8) and the sealing valve (9) through two flanges (2).

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